/**
 * Copyright (C) 2008 aileron.cc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package cc.aileron.dxo;

import java.util.HashMap;

import cc.aileron.accessor.PojoAccessorDxo;

import com.google.inject.Singleton;

/**
 * 
 * 数値の型自動変換
 * 
 * @author Aileron
 * 
 */
@Singleton
public class Number implements PojoAccessorDxo.Setter<java.lang.Number, Object>
{
    private static interface C
    {
        Object convert(final java.lang.Number number);
    }

    public Object setter(final java.lang.Number parameter,
            final Class<Object> resultClass)
    {
        final C c = map.get(resultClass.getName());
        if (c == null)
        {
            return parameter;
        }
        return c.convert(parameter);
    }

    private final HashMap<String, C> map = new HashMap<String, C>();
    {
        map.put("boolean",
                new C()
                {
                    public Boolean convert(final java.lang.Number number)
                    {
                        return number.intValue() != 0;
                    }
                });
        map.put("byte",
                new C()
                {

                    public Byte convert(final java.lang.Number number)
                    {
                        return number.byteValue();
                    }
                });
        map.put("short",
                new C()
                {

                    public Short convert(final java.lang.Number number)
                    {
                        return number.shortValue();
                    }
                });
        map.put("int",
                new C()
                {
                    public Integer convert(final java.lang.Number number)
                    {
                        return number.intValue();
                    }

                });
        map.put("long",
                new C()
                {

                    public Long convert(final java.lang.Number number)
                    {
                        return number.longValue();
                    }
                });
        map.put("float",
                new C()
                {

                    public Float convert(final java.lang.Number number)
                    {
                        return number.floatValue();
                    }
                });
        map.put("double",
                new C()
                {

                    public Double convert(final java.lang.Number number)
                    {
                        return number.doubleValue();
                    }
                });
    }
}
